Cog-wheel



L. 'ATWOOD] GOG WHEEL.

, (No Model.)

Patented Mar. 3, 1891.

UNITED STATE PAT NT @FFICE.

LEONARD ATW'OOD, OF PHILADELPHIA, PENNSYLVANIA.

COG-WHEEL.

SPECIFICATION forming part of Letters Patent No. 447,552, dated March 3,1891.

Application filed August 28, 1890. fierial No. 363,274, tNo model.)

To aZZ whom, it may concern;

Be it known that I, LEONARD Arwoon,a citizen of the United States, and aresident of Philadelphia, Pennsylvania, have invented certainImprovements in Cog WVheels, of which the following is a specification.

The object of my invention is to construct a cog-wheel in which theshanks of the teeth are embedded in the rim and fastened therein, andalso provide means by which the wheel, although keyed to the shaft, maybe readily removed therefrom in the manner de scribed hereinafter,reference being had to the accompanying drawings, in which- Figure 1 isa side view, partlyin section,of my improved cog-wheel with a number ofthe teeth inserted therein. Fig. 2 is a sectional plan View on the line1 2, Fig. 1.

Heretofore cog-wheels with insertible teeth have been provided with acomparatively thin rim, and the shanks of the teethare passed entirelythrough this rim and are keyed at the back of the rim, the keys beinggenerally exposed, and when a wheel has been fixed to a shaft it isgenerally a difficult task to remove the wheel without injuring one ofthe several parts. I overcome the above difficulties in the followingmanner, reference being had to the accompanying drawings, in which-= Ais the body of the wheel, keyed to the shaft B by an ordinary key b,fitting into keyways both in the wheel and in the shaft. Preferably cutin the wheel opposite to the keyway is a slot 0., in which is inserted ablock 0, of wood or other material that will take up the ringing soundof the wheel and deaden the noise. This block 0 is held in the slot by abolt 0, having a nut 0. After the wheel has been set upon the shaft andkeyed thereto the nut is turned on the bolt, so as to draw the wheeltightly upon the shaft. Thus the wheel is not only held by the key, butalso by friction. The rim A of the wheel in the present instance has aseries of pockets d, each pocket having a double taper, one portion d ofthe pocket tapering inward and the other portion (1 at the base of thepockettapering in the opposite direction, forming an undercut section,in which the tooth is expanded. The partitions forming the pockets aretied together at their bases bythe band a, so as to prevent thepartitions springing when the teeth are driven in and expanded.

D is the tooth. The shank c of said tooth is tapered to fit the taperedpockets d.

In each'of the side plates of the flange of the wheel are orifices t',and the shank of each tooth is slotted at the base, as shown in Fig. 1,the slot coming in line with the orifices in the side walls of theflange. Through these orifices and into the slotted portion of the toothis driven a pin f, which expands the base portion of the shank of thetooth into the undercut portion of the pocket, thus firmly locking thetooth to the flange of the wheel, the shank and its fastening beingincased by the flange. In the side walls of the slot in the tooth aretransverse grooves, and when the tooth is driven into its slot thegrooves are in line with the orifices in the walls of the pockets, sothat the pins are guided accurately as they are driven through thetooth. In some instances a small guiding-orifice may be made in theshank of the tooth, which will split when the pins are driven. By tyingthe partitions together and to the side walls by the band a I am enabledto connect the spokes or web of the wheel at the center, as shown,making a symmetrical wheel. By simply driving out one of the pins thetooth held thereby can be readily removed and replaced if necessary.

' I claim as my invention- 1. The combination of the flange havingundercut pockets therein and teeth in said pockets with transverse pinspassing through the side walls of the pockets and through the shanks ofthe teeth and expanding the teeth into the undercut portions of thesame, substantially as specified.

2. The combination of the flange, tapered and undercut pockets therein,and teeth having tapered and slotted shanks with transverse pins passingthrough the side Walls of the pockets and through the slotted portions Iof the teeth, whereby the teeth are expanded,

substantially as and for the purpose specified.

3. The combination of the wheel having a radial slot, an independentkey-seat therein, a shaft, and a key adapted to said shaft and to thekey-seat in the wheel with a bolt for drawing the wheel tightly to theshaft after it has been keyed thereto, substantially as specified.

4. The combination of the shaft, a Wheel having a key-seat therein, akey adapted to the shaft and wheel, a radial slot in said Wheel, and adeadening-block in said slot with a device for drawing the wheel tightlyto the shaft, substantially as described.

5. The combination of the flange having undercut pockets, cog-teeththerein, the shank of each cog-tooth slotted and having aguiding-groove, and pins passing through the side walls of the pocketsand through the guidinggrooves of the teeth, substantially as and forthe purpose specified.

LEONARD ATWOOD. \Vitnesses:

II. F. REARDON, HENRY IIoWsoN.

